Tunable blue emitting lead halide perovskites
AssigneeOxford University Innovation Limited
InventorsNobuya Sakai, Bernard Wenger, Henry James Snaith
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Abstract
The invention relates to perovskite compounds which have surprisingly good emission properties, particularly photoluminescent emission properties, in the blue region of the visible spectrum. These perovskites contain a mixture of cations or a mixture of halides, or both. The invention also relates to a photoactive material containing the perovskite species of the invention; to an optoelectronic device containing the photoactive material of the invention; to a method of producing blue light; and to the use of the photoactive material of the invention to emit blue light or as a phosphor.
Claims23
A perovskite of formula (I)
- [RbxCs(1-x)][Pb][BryCl(1-y)]3 (I)
- wherein
- x is greater than 0 and less than 1,
- y is greater than 0 and less than 1, and
- the perovskite has a peak emission wavelength of less than 500 nm.
A mixed perovskite of formula (II)
- {[A]2[M][X]4}a{[RbbCs(1-b)][Pb][BrcCl(1-c)]3}1-a (II)
- in crystalline or powder form, wherein
- [A] comprises one or more A cations which are monocations;
- [M] comprises one or more M cations which are metal or metalloid dications;
- [X] comprises one or more X anions which are halide anions;
- a is greater than 0 and less than 1;
- b is from 0 to 1;
- c is from 0 to 1;
- at least one of b and c is greater than 0 and less than 1;
- and
- the mixed perovskite has a peak emission wavelength of less than 500 nm.
A photoactive material comprising:
- (i) a perovskite of formula (I)
- [RbxCs(1-x)][Pb][BryCl(1-y)]3 (I)
- wherein
- x is greater than 0 and less than 1, y is greater than 0 and less than 1, and the perovskite has a peak emission wavelength of less than 500 nm;
- and/or
- (ii) a mixed perovskite of formula (II)
- {[A]2[M][X]4}a{[RbbCs(1-b)][Pb][BrcCl(1-c)]3}1-a (II)
- in crystalline or powder form, wherein
- [A] comprises one or more A cations which are monocations;
- [M] comprises one or more M cations which are metal or metalloid dications;
- [X] comprises one or more X anions which are halide anions;
- a is greater than 0 and less than 1;
- b is from 0 to 1;
- c is from 0 to 1;
- at least one of b and c is greater than 0 and less than 1;
- and
- the mixed perovskite has a peak emission wavelength of less than 500 nm.
Dependencies are inferred from the claim text.